In digital communication, it is very necessary to prevent the unlawful intrusion of unwanted parties. Apart from that, the authenticity of a signal being sent is a key factor otherwise false data can break the commitment between the sender and the receiver of the signal. By digital watermarking, both the insurance of the authenticity and the prevention of unlawful intrusion can be maintained by inserting information into the host signal. In this paper, an image watermarking technique is proposed. In the proposed technique, hybrid signals are used as watermarks. Hybrid means using images as well as an audio signal as watermarks. This can certainly increase the robustness of the proposed technique as in case of very rigorous attacks at least one watermark can be survived ensuring the true owner of the signal being sent. The watermarks are inserted in different levels of the host image using the entire energy distribution of the host image. The energy of the watermarks is divided to embed different parts of the energy in different levels of the host signal. For doing this, discrete wavelet transform (DWT) and singular value decomposition (SVD) are used. The proposed technique offers a PSNR (Peak Signal to Noise Ratio) of 67.8606 dB and NCC (Normalized Cross-Correlation) above 0.9.

中文翻译：

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一种混合信号作为水印的图像水印技术

在数字通信中，非常有必要防止不受欢迎的一方的非法侵入。除此之外，所发送信号的真实性是一个关键因素，否则虚假数据会破坏信号发送方和接收方之间的承诺。通过数字水印，可以通过在主机信号中插入信息来保证真实性和防止非法入侵。本文提出了一种图像水印技术。在所提出的技术中，混合信号被用作水印。混合意味着使用图像以及音频信号作为水印。这当然可以增加所提议技术的鲁棒性，因为在非常严格的攻击的情况下，至少可以保留一个水印，确保所发送信号的真正所有者。使用宿主图像的整个能量分布将水印插入宿主图像的不同级别。水印的能量被划分以将能量的不同部分嵌入到宿主信号的不同电平中。为此，使用了离散小波变换 (DWT) 和奇异值分解 (SVD)。所提出的技术提供了 67.8606 dB 的 PSNR（峰值信噪比）和高于 0.9 的 NCC（标准化互相关）。